Valve-gear.



Patented May l4, l9pl. J. F. HALL. VALVE GEAR.

UNITED STATES PATENT OFFICE.

JOHN F. HALL, OF SMITH CENTER, KANSAS.

VALVE-G EAR.

SPECIFICATION forming part of Letters Patent No. 674.266, dated May 14,1901.

Application filed October 25, 1900- Serial'No. 3 1,360. (No model.)

T0 or whom it may concern.-

Be it known that I, JOHN F. HALL, a citizen of the United States ofAmerica, residing at Smith Center, in the county of Smith and State ofKansas,have invented certain new and useful Improvements inVaive-Gear,of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to certain new and useful improvements invalve-gear for portable engines, locomotives, and other such engines asit becomes necessary to frequently reverse and wherein it is desirableat the same time to make it possible to graduate the cut-0d, so as touse the highest steam-pressure possible at the first end of the stroke,and thereby obtain the greatest amount of expansion that may be had andgive the amount of power required.

The above is therefore briefly the objects of my invention, and indescribing the same in detail reference will be had'to the accompanyingdrawings,forming a part ofthis specification, and wherein like numeralsof reference will be employed to designate like parts throughout bothviews, in which- Figure l is a side elevation of my improved valve-gearconnected to the valve. Fig. 2 is a detail perspective view of thedouble eccentric.

In the accompanying drawings, 1 indicates the cylinder of an engine; 2,the piston-rod, the latter connected by a rod 3 to the eccentric-shaft4. This shaft 4: carries the double eccentric 5 6, the former connectedby rod or lever 7 to the upper end of a link 8 and the latter connectedby a like rod or lever to the lower end of said link, this rod or leverbeing indicated by the referencenumeral 9. This link 8 is connected byarock-shaft 10 and rod 11 to the main valve, (not shown,) the rock-shaftbeing suitably supported, as shown at 12. The position at which the link8 engages the rock-shaft is regulated by means of a link 14:, connectedto the link 8 and attached to the lower end of a bell-crank 15, thelatter journaled in a bearing on the support of the rock-shaft,\vith itsupper end connected by a rod or lever 16, connected to thecontrolling-lever 17. 7

Connected to the rods or levers 7 9 near the eccentrics are rods orlevers l8 19, the former attached to a link 20 at the upper end thereofand the latter to the same link at the lower end thereof. This link 20engages a rockshaft 21, which is of slightly greaterlength than'therock-shaft 10 and is connected by a rod 22 to the auxiliary or cut-ofI"valve. (Not shown.)

The engagement or position of this link 20 with the rock-shaft isregulated by means of a link 23, connected to the link 20, with itsupper end attached to a rod or lever 24, that connects witha bell-crank25, having its upper end connected by arod 26 to the operating-lever 27.These operating-levers 17 and 27 are provided with the usual lock-leversand pawls for engagement with the usual racks for holding the levers atthe positions to which they have been moved.

The eccentrics 5 6 being as one eccentric, the links 8 2O operate inunison, and the throw given by each link to its rocker-shaft isdependent upon the position of the link in engaging the shaft, and itwill be observed that either link may be set independently of the other,so as to give the desiredthrow to the main valve or to the cut-offvalve, and by the movement of the lever controlling the cutoff valvethis valve may be caused to cut ofi the steam to the cylinder at anydesired stroke of the piston.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In the valve-gear, the combination with the eccentric-shaft and apair of eccentrics mounted thereon, of a main-valve-controlling link, arod connecting said link at its upper end to one eccentric, the like rodconnecting the link at its lower end tothe other eccentric, thecut-off-valve-controlling link, rods connecting said link to the rods ofthe mainvalve-controlling link, and means for adj usting the position ofsaid links, substantially as described.

2. In a valve-gear, the combination with the eccentric-shaft and a pairof eccentrics mounted thereon, of a main-valve-controlling link, arock-shaft engaging said link and connected to the main valve, 2. rod'connecting said link at its upper end to one of the eccentrics, a likered connecting said link at its lower end to the other of saideccentrics, a cut-oif-valve-con trolling link, connections between saidlast-mentioned link and the rods which connect the main valvecontrolling link to the eccentrics, a rock-shaft engaging thecut-off-valve-co11trolling link and c0nnected to the cut-off valve, andmeans for adjusting the position of said links, substantially asdescribed.

3. In a valve-gear, the combination with the eccentric-shaft and a pairof eccentrics mounted thereon, of a niain-valve-controlling link, acnt-off-valve-controlli11g; link, a pair of rods connecting theinain-valve-controlling link with the eccentrics, a pair of rodsconnecting the cut-olf-valve-controlling link with the first-mentionedpair of rods, separate connections between the links and theirrespective valves, and means forindependently adjusting the position ofsaid links whereby the throw of the valves may be controlled,substantially as described.

In testimony whereof I affix my signature in the presence of twowitnesses.

JOHN F. HALL. Witnesses:

JAMES F. GHELF, GEO. H. MARTY.

